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Finding the Fourth Proportional to 271.40, 407.10 and 217.40

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Solution

The fourth proportional to 271.40, 407.10 and 217.40 is: 326.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.40 : 407.10 = 217.40 : x
  2. Step 2: Convert to fraction form
    271.40/407.10 = 217.40/x
  3. Step 3: Cross multiply
    271.40x = 407.10 × 217.40
  4. Step 4: Simplify right side
    271.40x = 88,503.54
  5. Step 5: Solve for x
    x = 88,503.54/271.40
  6. Step 6: Final answer
    x = 326.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.